<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../vue.js"></script>
</head>

<body>
  <div id="app">
    <App></App>
  </div>
  <script>

    const Header = Vue.extend({
      name: "Header",
      template: "<div>header组件</div>"
    });

    const App = Vue.extend({
      name: "App",
      components: {
        Header
      },
      template: `<div>App组件
        <Header></Header>
        --{{message}}</div>`,
      data() {
        return {
          message: "app组件中的数据"
        };
      }
    });



    new Vue({
      el: "#app",
      data() {
        return {

        };
      },
      components: {
        App,
      }
    })
  </script>
</body>

</html>